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A 0.0150 kg bullet is shot into a4.0 kg block, at rest on a frictionless horizontal surface. The bullet remains lodged into the block. The block slides into a spring and compresses it by 3.8 cm. The spring constant of the spring is 2500 N/m.
b) Was any mechanical energy lost in this experiment? If so, when did it disappear and where did it go?
Yes, there is a loss of mechanical energy which is converted into potential energy of the spring system. The energy is lost during the compression of the spring and stored in the spring as the potential energy of the spring system.